Inch Vs Metric Feed 1

[mechvhstech]

I am spec-ing out a radial drill for our Chinese operation. All our specifications are in inches and the machines available in that plant are metric feed, so I installed a digital read out that helped them with the drills and feeds. But what about tapping a thread (say 11/2 threads per inch) how do I tackle this part? Any ideas?

-Thanks

mechvhs

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Mech Rulz

 

[BillPSU]

Tapping on a radial drill is done without feed. You engage the tap into the previously drilled hole and let the tap feed itself and then reverse the spindle and let the tap feed out. You sometimes have to apply some pressure to counter balance the wieght of the spindle. I believe your example of 11/2 is incorrect. More like 11 threads per inch or 2 mm pitch. These would easily be handled using the above process as long as the holes are through holes or holes with lots of clearance below the tap.

 

[mechvhstech]

That is 11 1/2 or .0869" pitch.

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Mech Rulz

 

[mechvhstech]

Thanks for your reply BillPSU, but I am dealing with a radial drill w/ feed. For 11 1/2 TPI it feeds @ .087", I wonder if i can use the same tool and feed at 2.2085 mm on the metric feed machine ??

Regards,

mechvhs

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Mech Rulz

 

[looslib]

Use a floating tap holder and get the feed as close as possible, just not higher.


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